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The key message of this chapter is that the disk I/O performance counters can reveal a significant amount of information on query processing, and you can effectively use the disk I/O counter values to help analyze query performance issues in scenarios where SQL Server must incur significant physical I/Os, such as when processing large queries. Despite much talk about preferring sequential I/Os to random I/Os, you cannot directly observe whether I/Os are sequential or random. For processing large SQL queries, you can instead choose to observe their I/O sizes and I/O throughputs. The key observation is that large I/Os are much more efficient than small I/Os, and large I/Os are often sequential I/Os, and SQL Server is optimized to take advantage of large I/Os. In practice, you need to exercise caution when observing disk I/O sizes as there is often a multitude of activities on a server, and it may be difficult to attribute the values of the disk I/O performance counters to any specific queries.

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constant everywhere along the line, although the actual values of E and I decrease with increasing distance from the source

Linchi Shea has been working with SQL Server since Version 4.21a. He works in the financial services sector in and around New York City. Linchi is passionate about creating robust and automated infrastructures for managing SQL Server in an enterprise environment. He has written many tools and utilities to simplify deploying, operating, and testing SQL Server. You can find him blogging about SQL Server enterprise issues at www.sqlblog.com. Linchi is a co-founder and co-lead of the NYC SQL Server users group, and has been a Microsoft MVP since 2002.

SQL Server gives many options for monitoring and troubleshooting, such as SQL Server Profiler and SQL Trace, Dynamic Management Views and Functions, the

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ima and minima are called loops and nodes, respectively At a current loop, the voltage is minimum (a voltage node), and at a current node, the voltage is maximum (a voltage loop) The current and voltage loops and nodes along a mismatched transmission line, if graphed as functions of the position on the line, form wavelike patterns that remain fixed over time They just stand there For this reason, they are called standing waves

default trace, trace flags, performance counters, deadlock graphs, ring buffers, blocked process reports, DBCC commands, various logs, and others. So you may wonder why anyone would need a new event infrastructure such as Extended Events. It may sound shocking, but the diversity of the tools is the main reason. Having so many techniques available makes it difficult to maintain the code for each new release of SQL Server. That s from a developer s point of view. For the rest of us customers, consultants, users, and even for Microsoft support it s challenging to obtain relevant performance or troubleshooting information. Why Because the information needed usually comes from multiple sources. Furthermore, each of the tools available before SQL Server 2008 has its own strengths and weaknesses. Think about monitoring SQL Server using SQL Server Profiler: it s graphical, easy to use, and can be used in correlation with PerfMon logs, but the performance overhead can be pretty serious. Extended Events is the potential event infrastructure for the next releases of SQL Server. This is my personal opinion, and the role of this chapter is to support this opinion with facts.